US4098575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peroxide value determining test for oils and fats
Assignee: Zaidin Hoijin Sugiyama Sangyo Kagaku Kenkyusho
•
Filing: 1976-04-13
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Granted: 1978-07-04
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Expires: 1996-04-13
Abstract
Abstract A test paper, manufactured by impregnating a glass fiber-made paper or cloth with a starch and potassium iodide reagent, liberates iodine on the test paper in such a quantity as to exactly correspond to the peroxide content of an oil or fat coming into contact therewith. Since the liberated iodine easily combines with the ambient starch and turns blue in accordance with the quantity of iodine upon subsequent addition of water, determination of the peroxide value, or consequently the edibility, of the oil or fat can be conveniently effected by determinaton of merely finding the intensity of the color developed on the test paper.
Inventors
- 👤 Setsuro Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:31
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; G01N31/00; G01N31/22; G01N31/228
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A method for determining the peroxide value of oils and fats, comprising: placing a predetermined amount of oil or fat on a glass fiber-made paper or cloth impregnated with a starch and potassium iodide reagent solution which has subsequently been dried; placing a predetermined amount of water on said paper or cloth on which the oil or fat has been placed; and comparing the color on said paper or cloth to a predetermined standard.
Claim 2
Independent Claim
74 words
A method for determining the peroxide value of oils and fats, comprising: placing a predetermined amount of oil or fat on a glass fiber-made paper or cloth impregnated with a starch and potassium iodide reagent solution which has subsequently been dried; placing a predetermined amount of water on said paper or cloth on which the oil or fat has been placed; and comparing the color on said paper or cloth to a predetermined standard.
Claim 3
Dependent Claim
22 words
A method as defined in claim 1 wherein said starch and potassium iodide reagent solution includes a small amount of citric acid.
Claim 4
Dependent Claim
23 words
A method as defined in claim 1 wherein said starch and potassium iodide reagent solution includes a small amount of a reducing agent.
Claim 5
Dependent Claim
22 words
A method as defined in claim 3, wherein said starch and potassium iodide reagent solution includes a small amount of citric acid.
Claim 6
Dependent Claim
20 words
A method as defined in claim 1 wherein said glass fiber-made paper or cloth is a glass fiber-made filter paper.
Claim 7
Dependent Claim
23 words
A method as defined in claim 5, wherein said starch and potassium iodide reagent solution includes a small amount of a reducing agent.
Claim 8
Dependent Claim
22 words
A method as defined in claim 5, wherein said starch and potassium iodide reagent solution includes a small amount of citric acid.
References Cited (Backward Citations)
US3183173A
Cited
US3705012A
Cited
US3897214A
Cited
US3846247A
Cited
US3826620A
Cited
US3901657A
Cited
US3937613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |